Mechanical movement.



C. P. POND.

MECHANICAL MOVEMENT.

APPLICATION men MAR.28. m7.

Patented Sept. 24, 1918.

3 SHEETS-SHEET I Patented Sept. 24, 1918.

3 SHEETS-SHEET 2- w: NORRIS rz'rzns 0a.. PHOTO-Ural. WAsnmm mu, m. c.

C. P. POND.

MECHANICAL MOVEMENT.

APPLICATION FILED MAR. 28, 1911.

1,279,903. I PatentedSept. 24,1918.

3 SHEETS-SHEET 3.

UNITED STATES CLARKE P. POND, OF PHILADELPHIA, PENNSYLVANIA.

PATENT OFFICE.

MECHANICAL MOVEMENT. 7

Specification of Letters Patent. Patented Sept, 24, 1918,

Application filed March 28, 1917. Serial N 0. 158,066.

Mechanical Movements, of which the following is a specification. 7

One object of my invention is to provide a novel combination ofmechanical elements whereby a substantially constant operating forceapplied to a driving member at a substantially uniform rate is caused toexert a force on a member to be operated which shall vary from a minimumto a maximum or vice versa, the invention more particularlycontemplating a device especially designed for swinging window sashes ontheir supporting hinges or pivots with a force which shall beautomatically increased at a definite rate as said windows are moved inone direction and correspondingly diminished as they are moved in theopposite direction.

A further, object of the invention is to provide a relatively simple,substantial and eflicient mechanical movement whereby rotary motion maybe transformed to rectilinear movement, the arrangement of parts beingsuch that power delivered to one of the elements of the device at asubstantially uniform rate shall be transferred to a structure to beoperated at a variable rate.

More particularly it is desired to provide a combination of partswhereby the operation of a driving member at a constant speed shallresult in operating a driven member at a variable speed; the arrangementof parts being such as to suit the apparatus for the operation ofcertain types of'sash in which the load gradually increases as the sashare opened and similarly decreases as said sash are closed. My device isespecially adapted to replace those forms of constant speed mechanismwhich since they required a gear reduction suflicient to permit easyoperation of the drivingmotor or hand chain at the maximum loads,necessarily also operated the sash or other member at slow speeds underconditions of minimum load.

These objects and other advantageous ends I secure as hereinafter setforth, reference being had to the accompanying drawings, in

which,

Fig. 1 is a side elevation illustrating the V preferredform of myinvention;

7 Figs. 2 and 3 are respectively a front elevation and a in Fig. 1; and

Fig. 4 is a sideelevation of a modified form of the invention.

In the above drawings 1 represents a frame or other suitable form ofsupporting structure constructed in the present instance plan of theapparatus shown for attachment to a vertical surface such as a wall,column or the like, and such frame includes two horizontally projectingmem here 2 and 3, spaced apart to provide bear- 1ngs or guides 4 and'5for a vertically extending. screw in the form of an eloi'igated threadedrod 6. .The framelikewise has rigidly connected to or integral with ittwo substantially parallel vertically extending channel members 7 spacedapart to provide guides'for a pair of blocks 8, to which ahead plece 9on the upper" end of-the screw 6 1S connected by a'spindle or pivot pin10. The two channel guides 7 are rigidly C011? nect'ed to the frame l aswell as braced by means of a, bracket structure 11, whereby they aresuitably reinforced. against a force tending to deflect their upper endstoward the left from the position showri'inFigJl.

Operative in the space between the frame PI'OJBCtlODS 2 and3 is ahorizontally mounted chain wheel 12 whose hub is threaded to con-- ingarms 16, suitably placed on the frame structure 1. I At suitable points,preferably immedi- "ately above the chain pulley 12, are mounted a pairof sheaves or pulleys 17 and 18 operative in parallel vertical planesand mounted on spindles supported partly by the frame structure 1 andpartly by bearing brackets 19 forming part of or rigidly connected tosaid structure. These two pulleys 17 and 18 have passing around them apair of flexible power transmitting members in theform of chains 20 and21, the upper runs of which are connected together by a yoke 22,whileltheir lower runs are similarly connected by a yoke 23.

-The ends of. two horizontally extending parallel rods or cables 2% andof any desired lengths are respectively connected with these two yokes22 and 23, and their opposite ends may be connected members similar tothe chains 20 and 21, passing around suitable supporting pulleys of thesame construction as the pulleys 17 and 18, so that said rods or, cableswith the chains at their opposite ends, form in effect an endless powertransmitting line whose two members 2d and 25 are simultanemisly movablein opposite directions and have connected to them any desired members tobe operated, such as a series of swinging or other movably mountedwindow sashes, which for example, may be arranged as described andclaimed in my Patent No. 886,- 851, dated May 5, 1908. In the presentcase, however, as the mechanism has to do with means for transmittingpower from the chain 13 to the rods 24. and 25, I have not illustratedthis apparatus for supporting and guiding the opposite ends of saidrods, especially since a typical form of such ap 7aratus is disclosed inmy patent aforesaid and forms no part of the present invention.

The yoke22 and the upper end portion of the screw'6 provided by the head9, are connected by a member in the form of a beam 26 which isillustrated as pivoted to each of said elements and is preferably madeto have a' depth'increasing from both of its end toward its middle. Ator adjacent this latter point the beam or link 26 is connected by a pairof links 27 to a point on the fixed frame 1 adjacent the pulley wheels17 and 18, by means of a pivot pin whose center line is immediatelyadjacent or within a horizontal plane defined by the upper runs of thechains 20 and 21. Both of the links 27, like the link or beam 26, arepreferably of increased depth from the ends toward their middle parts.

With the above described arrangement if powerbe applied by hand ormachine to the chain 13 so as to turn the chain wheel 12 at asubstantially constant rate in one direction, the screw 6 will belongitudinally moved through the nut constituting the hub of said chainwheel, and if the parts be in the relative positions shown in full linesin Fig. 1, the rotation of said wheel 12 in the proper directionwillmove the head 9 of said screw downwardly in its'guides 7. Owing to the'coaction of the members 26 and 27 and the rod 25, the lower runs of thechains 20 and 21' will be moved in the direction indicated by the arrowFig. 1. It will be noted that while at the start, this movement isrelatively rapid and the action of the member 26 is such that the forceexerted by the rod 25 is a minimum, the rate of movement dimin'ishesan'dthe force exerted increases as the parts move into a position beyond thepositions indicated'in dotted lines until by tie time the head 9 reachesthe lower limit of its movement, the rod 25 is moving at a reduced. ratewhile the force exerted upon it is a maximum, 7

Conversely if the direction of the operation of the chain 13 bereversed, the head 9 is moved upwardly in its guides, and while theforce eXertedto move the rod 24 in the direction of the arrow, Fig. 1,is a maximum, the speed of movement of said rod and its attachedapparatus is increased from a minimum until the parts approach the p0sition shown in full lines, Fig. 1, when the speed of movement is amaximum" and the force exerted is a minimum.

'Such a combination ofparts'as-that above described particularlyvaluable for the operation of lines of window sashes such as arecommonly employed in factories, power iouses and the like, where thepower required to move such sashes increases as these are swung out of avertical position, but where nevertheless it is desirable to maintainthe load on the operating motor substantiallyconstant regardless of theposition of said sashes. 7

As will be understood by those skilled in the art, there are availablefor use other devices whereby the head 9 and therefore the upper end ofthe beam 26, may be caused to move in the same manner as with themechanism shown in'Figs. 1 to of the drawings. Among such devices may benoted the combination of parts shown in Fig. 1 wherein I havesubstituted a vertically extending rack 450' for the screw 6 and haveprovideda pinion l1 atall timesfin mesh with said rack. Since itis'advisable that the various parts shall be at all times locked in anygiven position,1 have provided means for locking this rack and at thesame time actuating it, consisting of a worm wheel 42 fixed to the shaft&3 on which the pinion 41 is mounted and driven by a worm 4.4. As beforethe motive powerv for operating the apparatus may bejprovided by anysuitable driving"ineans such as the chain shown connected to the worm.

Vith .lCll apparatuses that above de scribed, it is convenientlypossible to move one or more groups or series of sashes ma forge shop,foundry or other factory'where smoke or gases are developed atintervals, so as to quickly open them sufficiently for winterventilation and similarly close such partial opening at several timesthe speed which would be possible with theordinaryforms of mechanism.

I'claim:

1. The combination of twomembersmovably guided in straight lines atright angles to each other; a bar pivoted adjacent its ends to saidmembers respectively; a relatively fixed structure and a link pivotallyconnected to said fixed structure in a line passing through the point ofintersection of the lines of movement of said members and also pivotallyconnected to said bar.

2. The combination of two members movable in straight lines atrightangles to each other; a fixed structure having a guideway for one ofsaid members; a screw connected to said member; a nut on the screw;means for turning the nut to longitudinally move the screw and themember; a second member movable in a line at right angles to said firstmember; a bar connecting said members; and means connected to the barfor causing that part thereof connected to the second member to move ina straight line when the nut is turned.

3. The combination of a fixed structure; a member movable thereon in astraight line; a screw connected to said member; a pulley having athreaded hub for the passage of said screw a flexible elementfor-turning said pulley; a second member movable in a line at rightangles to that of the first member; a bar connecting said members; and alink for causing that part of the bar connected to the second member tomove in a straight line.

4. The combination of a fixed frame having an elongated guideway; a headslidable screw; a bar pivotally connected to the head and'to said powertransmitting member; with a link pivoted to the bar and also pivoted tothe frame in a line passing through both the power transmitting memberand through the screw.

5. The combination of a supporting frame having an elongated guidewayand a bearing; a head slidable in the guideway; a screw operative in thebearing and connected to the head; a nut on the screw held fromlongitudinal movement by the bearing; a pulley on the nut; a member forturning the pulley; an endless member to be actuated; a pulley on theframe partially supporting said endless member; a link pivoted at oneend to the frame; with a bar having one end connected to the head, itssecond end con-l nected to the endless member and its middle portionconnected to the second end of'the link.

'In witness whereof I aflix my signature.

CLARKE P. POND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

